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A frame of reference has four coordinates, x, y, z, and t is referred to as the_____________

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A frame of reference has four coordinates, x, y, z, and t is referred to as the_____________

(a) Inertial frame of reference

(b) Non-inertial frame of reference

(c) Space-time reference

(d) Four-dimensional plane

I got this question in an online interview.

The doubt is from Einstein’s Special Theory of Relativity in portion Ultrasonics & Relativity of Engineering Physics I

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Right answer is (c) Space-time reference

To explain I would say: Such a frame, having four coordinates of x, y, z and time t is called the space-time frame. It plays a major role in Einstein’s special theory of relativity.

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